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Research Papers: Multiphase Flows

Two-Dimensional Simulation of the Collapse of Vapor Bubbles Near a Wall

[+] Author and Article Information
Luo Jing

 Wuhan Research Institute of Materials Protection, 126 Bao Feng Er Lu, Wuhan, Hubei 430030, P.R.C.

Li Jian

 Wuhan Research Institute of Materials Protection, 126 Bao Feng Er Lu, Wuhan, Hubei 430030, P.R.C.lijian@rimp.com.cn

Dong Guangneng

 Xi’an Jiaotong University, 28 Xian Ning Xi Lu, Xi’An, Shanxi 710049, P.R.C.

J. Fluids Eng 130(9), 091301 (Aug 11, 2008) (4 pages) doi:10.1115/1.2953233 History: Received May 23, 2007; Revised April 28, 2008; Published August 11, 2008

In order to investigate the erosion extent and mode of cavitation in different states by the commercial code FLUENT and evaluate the reliability of the software, the collapse processes of a vapor bubble, which was near or on the wall under the conditions in the stationary water or the high speed water, were simulated by the numerical calculation by using a 2D model. The results are in accordance with results presented by other researchers, so the simulation may testify to the validation of the code. We suppose that a bevel jet, which is generated contrary to the flow direction when the bubble collapses in high speed flow, may cause the ripple and fish-scale pit damage found on the transition parts of many hydraulic systems.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Collapse process of a bubble near the wall. The initial radius of the bubble is 0.5mm, the pressure of the exterior region far from the bubble is 2MPa, and the initial velocity of water is 0.

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Figure 2

Collapse process of a bubble on the wall. The initial radius of the bubble is 0.5mm, the pressure of the exterior region far from the bubble is 2MPa, and the initial velocity of water is 0.

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Figure 3

Collapse process of a bubble on the wall. The initial radius of the bubble is 0.5mm, the pressure of the exterior region far from the bubble is 2MPa, and the initial velocity of water is 30m∕s from the left to the right.

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Figure 4

Counter-rotating vortices

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Figure 5

Jet velocities during bubbles collapse at three conditions

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Figure 6

Jet vector of a bubble on wall before complete collapse (the initial mean velocity of the water is 30m∕s and the time is at 22.4μs)

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Figure 7

Sketch of fish-scale pit

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Figure 8

Maximum pressure on the wall during bubble collapse

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Figure 9

Shock waves generated when a bubble near the wall has collapsed completely

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Figure 10

Pressure distribution on the wall after the bubble near the wall is collapsed completely

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